Fair Value Measurements (Summary Of Changes In Level 3 Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2023	Mar. 31, 2022
Fair Value Assets Measured on Recurring Basis [Roll Forward]
Beginning balance		$ 179,883	$ 149,961
Total gains or losses (realized /unrealized), included in earnings		2,309	6,955
Total gains or losses (realized/unrealized), included in other comprehensive income	[1]	26	(83)
Investment Securities Called		(1,000)	0
Discount accretion		47	1
Purchase of private equity securities		10,532	300
Sale/pay down of private equity investments		(27,492)	(1,745)
Purchase Of Risk Participation Agreement		0	145
Ending balance		164,305	155,534
Total gains or losses for the annual period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end		2,309	7,717
Gains (Losses) included in OCI Attributable to Change in Unrealized Gains (Losses) Relating to Assets Still Held, Total		4	(83)
State and municipal obligations [Member]
Fair Value Assets Measured on Recurring Basis [Roll Forward]
Beginning balance		1,841	1,984
Total gains or losses (realized /unrealized), included in earnings		0	0
Total gains or losses (realized/unrealized), included in other comprehensive income	[1]	26	(83)
Investment Securities Called		(1,000)	0
Discount accretion		47	1
Purchase of private equity securities		0	0
Sale/pay down of private equity investments		0	0
Purchase Of Risk Participation Agreement		0	0
Ending balance		914	1,902
Total gains or losses for the annual period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end		0	0
Gains (Losses) included in OCI Attributable to Change in Unrealized Gains (Losses) Relating to Assets Still Held, Total		4	(83)
Private Equity Investments [Member]
Fair Value Assets Measured on Recurring Basis [Roll Forward]
Beginning balance		178,127	147,406
Total gains or losses (realized /unrealized), included in earnings		2,251	7,450
Total gains or losses (realized/unrealized), included in other comprehensive income	[1]	0	0
Investment Securities Called		0	0
Discount accretion		0	0
Purchase of private equity securities		10,532	300
Sale/pay down of private equity investments		(27,492)	(1,745)
Purchase Of Risk Participation Agreement		0	0
Ending balance		163,418	153,411
Total gains or losses for the annual period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end		2,251	7,450
Gains (Losses) included in OCI Attributable to Change in Unrealized Gains (Losses) Relating to Assets Still Held, Total		0	0
Derivatives [Member]
Fair Value Assets Measured on Recurring Basis [Roll Forward]
Beginning balance		(85)	571
Total gains or losses (realized /unrealized), included in earnings		58	(495)
Total gains or losses (realized/unrealized), included in other comprehensive income	[1]	0	0
Investment Securities Called		0	0
Discount accretion		0	0
Purchase of private equity securities		0	0
Sale/pay down of private equity investments		0	0
Purchase Of Risk Participation Agreement		0	145
Ending balance		(27)	221
Total gains or losses for the annual period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end		58	267
Gains (Losses) included in OCI Attributable to Change in Unrealized Gains (Losses) Relating to Assets Still Held, Total		$ 0	$ 0

[1] * Included in "net unrealized gains (losses) on available for sale debt securities" in the consolidated statements of comprehensive income.